Honestly, in this case I think your T should request of the other T that he refrain from wearing the cologne. You shouldn't have to work on this memory while triggered.

Smell is an incredibly powerful trigger and you're not a freak for being sensitive to it.

Maybe this will make you feel better:

I had an overwhelming flashback once to the sight of a small, dark storage room. It was connected to the main room of my T's office, and exited the office. So it was a way for the office to have a separate entrance and exit, for privacy. My first visit to this new office, we got up to leave and my T went before me and opened the door and walked through to open the outer door. As soon as I crossed the threshold into that storage room, I had a massive flashback, and when it had passed, I found that I had peed--an obvious spot on the carpet!

I thought I'd never get past the shame of being triggered like that. My T was wonderful about it, and after we processed the memory it connected to, it all made perfect sense.

Let your T help you through this. The fact that he realized you were triggered shows that he only cares about helping you.